Step 7. The bracket around the connectors J3 (see Figure 2.1) should fit in the slot where you removed the blank panel. Secure the bracket with the bracket screw (see Figure 2.2) before making the internal and external SCSI bus connections.

2.2.3 Connecting the SCSI Peripherals

SCSI bus connections to the LSI8751D inside your computer are made with an unshielded, 68-conductor ribbon cable (see Figure 2.3). One side of this cable is marked with a color to indicate the pin-1 side. Sometimes the connectors on this cable are keyed to ensure proper pin-1 connection.

All external SCSI bus connections to the LSI8751D are made with shielded, 68-conductor cables (see Figure 2.3). The connectors on this cable are always keyed to ensure proper pin-1 connection.

Table 2.1 lists the SCSI bus widths and speeds as established by the SCSI Trade Association (STA).

Table 2.1 SCSI Bus Widths and Speeds

 

 

SCSI Bus Speed

 

SCSI Bus

Maximum Data Rate,

STA Terms

Width, Bits

Mbytes/s

 

 

 

SCSI-1

8

5

 

 

 

Fast SCSI

8

10

 

 

 

Fast Wide SCSI

16

20

 

 

 

Ultra SCSI

8

20

 

 

 

Wide Ultra SCSI

16

40

 

 

 

Ultra2 SCSI

8

40

 

 

 

Wide Ultra2 SCSI

16

80

 

 

 

Important: Use only cables designed and specified for operation with Ultra SCSI devices to make connections to the LSI8751D. See Figure 2.3 for an example of the required cables.

Detailed Installation Procedure

2-5